Function isolated_modules

Lib/test/support/import_helper.py:286–294

Save modules on entry and cleanup on exit.

()

@contextlib.contextmanager
def isolated_modules():
    """
    Save modules on entry and cleanup on exit.
    """
    (saved,) = modules_setup()
    try:
        yield
    finally:
        modules_cleanup(saved)


def mock_register_at_fork(func):